Move ui/gfx/codec/ into its own component.

ui/gfx/codec/jpeg_codec.h

Index: ui/gfx/codec/jpeg_codec.h
diff --git a/ui/gfx/codec/jpeg_codec.h b/ui/gfx/codec/jpeg_codec.h
index 3cc510bdb0669cae444ce4906105aca1fb4fe5bf..5d10be59cb1e3f21dcb79e3c2677630decc2d469 100644
--- a/ui/gfx/codec/jpeg_codec.h
+++ b/ui/gfx/codec/jpeg_codec.h
@@ -10,7 +10,7 @@
 #include <memory>
 #include <vector>
 
-#include "ui/gfx/gfx_export.h"
+#include "ui/gfx/codec/codec_export.h"
 
 class SkBitmap;
 
@@ -20,7 +20,7 @@ namespace gfx {
 // which has an inconvenient interface for callers. This is only used for UI
 // elements, WebKit has its own more complicated JPEG decoder which handles,
 // among other things, partially downloaded data.
-class GFX_EXPORT JPEGCodec {
+class CODEC_EXPORT JPEGCodec {
  public:
   enum ColorFormat {
     // 3 bytes per pixel (packed), in RGB order regardless of endianness.